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skin test n.
A test for detection of an allergy or infectious disease, performed by means of a patch test, a scratch test, or an intracutaneous injection of an allergen or extract of a disease-causing organism.
introduction of a specific test substance into the skin of an individual, either by injection or by scratching the skin, to determine that individual's possible allergy to certain substances or his susceptibility or immunity to certain diseases. A skin test is usually considered positive when the skin becomes red and swollen at the site of contact with the test material and is considered negative when there is no skin reaction. See also tuberculin test.